\triangledownThe nabla symbol, represented as \triangledown, is used in vector calculus to denote the vector differential operator. It is often used to represent operations such as divergence, gradient, and curl in mathematical expressions.
Divergence of a vector field \mathbf{F}
\triangledown \cdot \mathbf{F}Curl of a vector field \mathbf{F}
\triangledown \times \mathbf{F}Gradient of a scalar field f
\triangledown f